In the tradition of The Professor and the Madman, a "brisk and vivid"( Los Angeles Times) account of an obsessive scholar. Polymath, eccentric, and synonym aficionado, Peter Mark Roget had a host of female admirers, was one of the first to test the effects of laughing gas, invented the slide rule, and narrowly escaped jail in Napoleon's France. But Roget is best known for making lists. After the tragic turmoil...